mmc: mmci: Enable Device Tree support for ux500 variants

Provide a means to collect attributes specific to ST-Ericsson's ux500
variant series. This patch registers itself as the AMBA driver to be
called during the probe process. Once all attributes and ux500 specifics
are are collected the normal mmci core probe is called.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Chris Ball <cjb@laptop.org>
mmc: mmci: Add required documentation for Device Tree bindings

This provides full documentation detailing each compulsory,
optional and device (variant) specific properties available
for use within the MMCI Device Tree.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Arnd Bergmann <arndb@arndb.de>
Signed-off-by: Chris Ball <cjb@laptop.org>
mmc: mmci: Use correct GPIO binding for IRQ requests

Now there are irqdomains in place for Snowball, we can request GPIO
IRQs directly by their binding. This replaces the previous method
of hard-coding the hwirq using u32 values in the DT.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
mmc: mmci: Fix compiler error when CONFIG_OF is not set

error: implicit declaration of function 'mmci_dt_populate_generic_pdata'

This is due to the '#if CONFIG_OF' guards placed around
mmci_dt_populate_generic_pdata(), but not around the call to it. We
repair this by inserting a stub which elegantly returns when CONFIG_OF
is not set.

Reported-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
mmc: core: fix the decision of HS200/DDR card-type

Current implementation decides the card type exclusively. Even though
eMMC device can support both HS200 and DDR mode, card type will be
set only for HS200. If the host doesn't support HS200 but has DDR
capability, then DDR mode can't be selected.

Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
Reviewed-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
mmc: core: fix the signaling 1.8V for HS200

Currently only 1.2V is treated for HS200 mode. If the host has only
1.8V I/O capability not 1.2V, mmc_set_signal_voltage can't be called
for 1.8V HS200. EXT_CSD_CARD_TYPE_SDR_1_8V needs to be considered.

Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
Reviewed-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
mmc: core: skip card initialization if power class selection fails

With current implementation of power class selection,
mmc_select_powerclass() should never fail. So treat any error
returned by this function as serious enough to skip the card
initialization.

Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
Reviewed-by: Namjae Jeon <linkinjeon@gmail.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
mmc: queue: rename mmc_request function

The name mmc_request is used for both the issue function
and a data structure, which creates conflicts in symbol lookups
in editors. Rename the function to mmc_request_fn.

Signed-off-by: Venkatraman S <svenkatr@ti.com>
Reviewed-by: Namjae Jeon <linkinjeon@gmail.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
mmc: queue: remove redundant memsets

Not needed to memset, as they are pointers and are assigned
to proper values in the next line anyway.

Signed-off-by: Venkatraman S <svenkatr@ti.com>
Reviewed-by: Namjae Jeon <linkinjeon@gmail.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
mmc: dw_mmc: make multiple instances of dw_mci_card_workqueue

The variable 'dw_mci_card_workqueue' is a global variable shared between
multiple instances of the dw_mmc host controller. Due to this, data
corruption has been noticed when multiple instances of dw_mmc controllers
are actively reading/writing the media. Fix this by adding a instance
of 'struct workqueue_struct' for each host instance and removing the
global 'dw_mci_card_workqueue' instance.

Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Acked-by: Will Newton <will.newton@imgtec.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
mmc: core: Prevent eMMC VCC supply to be cut from late init

For eMMC cards that has been initialized from a bootloader,
the VCC voltage supply must not be cut in an uncontrolled
manner, without first sending SLEEP or POWEROFF_NOTIFY.

The regulator_init_complete late initcall, may cut the VCC
regulator if it's reference counter is zero. To be able to
prevent the regulator from being cut, mmc_start_host, which
should execute at device init and thus before late init,
calls mmc_power_up. Then the host driver is able to increase
the reference to the regulator.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
mmc: card: Avoid null pointer dereference

After the null check on md the code jumped to cmd_done, which then
will dereference md in mmc_blk_put. This patch avoids the possible
null pointer dereference in that case.

Signed-off-by: Philippe De Swert <philippedeswert@gmail.com>
Reviewed-by: Namjae Jeon <linkinjeon@gmail.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
mmc: core: Remove dead code

bus_width is passed to the function and when 0 (MMC_BUS_WIDTH_1)
will cause the function to return. So in in the second test it
definitely is different from 0, and the third test is redundant.

Signed-off-by: Philippe De Swert <philippedeswert@gmail.com>
Reviewed-by: Namjae Jeon <linkinjeon@gmail.com>
Acked-by: Philip Rakity <prakity@marvell.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
mmc: omap: convert to per instance workqueue

Currently, a global mmc_omap_wq is created for all instances of omap
hosts, which can lead to races and doesn't lend itself to unload the
module cleanly.  Instead, create per instance workqueue and remove
 the common workqueue.

Signed-off-by: Venkatraman S <svenkatr@ti.com>
Acked-by: Balaji T K <balajitk@ti.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
mmc: omap: make it behave well as a module

Use proper __devinit and __devexit annotation for driver functions.
Instantiate the probe function for driver_ops instead of a probe in
the register function.

Signed-off-by: Venkatraman S <svenkatr@ti.com>
Acked-by: Balaji T K <balajitk@ti.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
mmc: omap: convert to module_platform_driver

Get rid of boilerplate code by using module_platform_driver macro,
no functional changes.

Signed-off-by: Venkatraman S <svenkatr@ti.com>
Acked-by: Balaji T K <balajitk@ti.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
mmc: dw_mmc: Fixed sdio interrupt mask bit setting bug

The sdio interrupt mask bits are arranged in [31:16].
(1 << SDMMC_INT_SDIO(slot->id))) does 16 bits left shift twice.
So this patch changes to do 16 bits left shift only one time.

Signed-off-by: Kyoungil Kim <ki0351.kim@samsung.com>
Acked-by: Shashidhar Hiremath <shashidharh@vayavyalabs.com>
Acked-by: Will Newton <will.newton@imgtec.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
mmc: atmel-mci: the r/w proof capability lack was not well managed

First mci IPs (mainly on rm9200 and 9261) don't have the r/w proof
capability.  The driver didn't work correctly without this capability
in PDC mode because of the double buffer switch which is too slow
even if we stop the transfer to perform this switch.

Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
mmc: atmel-mci: change the state machine for compatibility with old IP

The state machine use in atmel-mci can't work with old IP versions
(< 0x200).  This patch allows to have a common state machine for all
versions in order to remove at91-mci driver only used for old versions.

Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
mmc: atmel-mci: add support for version lower than v2xx

Fix mci IP bugs and endianness issue.

Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: Chris Ball <cjb@laptop.org>